export function parseTime(time, pattern = '{y}-{m}-{d} {h}:{i}:{s}') {
    if (arguments.length === 0 || !time) {
        return null;
    }

    const format = pattern;
    let date;
    if (typeof time === 'object') {
        date = time;
    } else {
        if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
            time = parseInt(time);
        }
        if ((typeof time === 'number') && (time.toString().length === 10)) {
            time = time * 1000;
        }
        date = new Date(time);
    }

    const formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay()
    };

    return format.replace(/{([ymdhisa])+}/g, (result, key) => {
        let value = formatObj[key];
        if (key === 'a') {
            return ['日', '一', '二', '三', '四', '五', '六'][value];
        }
        if (result.length > 0 && value < 10) {
            value = '0' + value;
        }
        return value || 0;
    });
}